For a lot less money and work, why not make one of those inflatable reflectors? Sorta like an inflatable helium balloon made of Mylar, but has the reflecting material on the back side and clear Mylar on the front side. When inflated, the shape becomes practically parabolic to focus the concentrated sunrays. These cost a fraction of what's been depicted above.
Probably, you could make your own, provided you learn heat welding of the Mylar, or find suitable adhesive. Very light weight. So cheap you could make a bunch of them to capture much more sunlight for the same or less cost as those shown above.
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